powershell - Rename fails because it represents a path or device name -

when run following command:

rename-item some\long\path\filename.txt some\long\path\newname.txt 

i receive following error message:

cannot rename specified target, because represents path or device name.

i've tried wrapping paths in quotes , doesn't succeed either.

for second argument, just use new name not full path. is, this:

rename-item some\long\path\filename.txt newname.txt 

from docs, says of -newname<string>

enter name, not path , name. if enter path different path specified in path parameter, rename-item generates error.